use libc;

#[repr(C)]
#[derive(Copy, Clone)]
pub struct C2RustUnnamed {
  pub fn_0: libc::c_char,
  pub subarg: libc::c_char,
}

/*
 * setlogcons: Send kernel messages to the current console or to console N
 *
 * Copyright (C) 2006 by Jan Kiszka <jan.kiszka@web.de>
 *
 * Based on setlogcons (kbd-1.12) by Andries E. Brouwer
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */
//config:config SETLOGCONS
//config:	bool "setlogcons (1.8 kb)"
//config:	default y
//config:	select PLATFORM_LINUX
//config:	help
//config:	This program redirects the output console of kernel messages.
//applet:IF_SETLOGCONS(APPLET_NOEXEC(setlogcons, setlogcons, BB_DIR_USR_SBIN, SUID_DROP, setlogcons))
//kbuild:lib-$(CONFIG_SETLOGCONS) += setlogcons.o
//usage:#define setlogcons_trivial_usage
//usage:       "[N]"
//usage:#define setlogcons_full_usage "\n\n"
//usage:       "Pin kernel output to VT console N. Default:0 (do not pin)"
// Comment from kernel source:
/* ...
 * By default, the kernel messages are always printed on the current virtual
 * console. However, the user may modify that default with the
 * TIOCL_SETKMSGREDIRECT ioctl call.
 *
 * This function sets the kernel message console to be @new. It returns the old
 * virtual console number. The virtual terminal number 0 (both as parameter and
 * return value) means no redirection (i.e. always printed on the currently
 * active console).
 */
pub unsafe fn setlogcons_main(
  mut _argc: libc::c_int,
  mut argv: *mut *mut libc::c_char,
) -> libc::c_int {
  let mut devname: *mut libc::c_char = std::ptr::null_mut::<libc::c_char>();
  let mut arg: C2RustUnnamed = {
    let mut init = C2RustUnnamed {
      fn_0: 11i32 as libc::c_char,
      subarg: 0 as libc::c_char,
    };
    init
  };
  if !(*argv.offset(1)).is_null() {
    arg.subarg =
      crate::libbb::xatonum::xatou_range(*argv.offset(1), 0 as libc::c_uint, 63i32 as libc::c_uint)
        as libc::c_char
  }
  /* Can just call it on "/dev/tty1" always, but...
   * in my testing, inactive (never opened) VTs are not
   * redirected to, despite ioctl not failing.
   *
   * By using "/dev/ttyN", ensure it is activated.
   */
  devname = crate::libbb::xfuncs_printf::xasprintf(
    b"/dev/tty%u\x00" as *const u8 as *const libc::c_char,
    arg.subarg as libc::c_int,
  );
  crate::libbb::xfuncs_printf::bb_xioctl(
    crate::libbb::xfuncs_printf::xopen(devname, 0),
    0x541ci32 as libc::c_uint,
    &mut arg as *mut C2RustUnnamed as *mut libc::c_void,
    b"TIOCLINUX\x00" as *const u8 as *const libc::c_char,
  );
  return 0;
}
